It may offend us to hear our own thoughts expressed by others: we are not sure enough of their souls.

In politics, yesterday's lie is attacked only to flatter today's.

It is sometimes important for science to know how to forget the things she is surest of.

We are not naïve enough to ask for pure men; we ask merely for men whose impurity does not conflict with the obligations of their job.

Greatness, in order to gain recognition, must all too often consent to ape greatness.

What makes our opponents useful is that they allow us to believe that without them we would be able to realize our goals.

Science has made us gods even before we are worthy of being men.